... be set in Alinor, and the Thalmor should be the Big Bads. Basically, they would want to destroy the impure Nirn and you, of course, would have to stop them. The Eye of Magnus could be a piece of their plans.
It would be the perfect ending for me, solving the man/mer conflict once and for all and showing that Mehrunes Dagon is NOT mankind's/Shezarr's worst enemy. Aedric worship has a very dark side.